bbbb bbdd bbdo bcbc bccc bcuc bdbc bddc bobb bobo bobu bock boco bocu bodb bodo bodu boko boku boob booc bood book boud bouk bubb bubo bubu bucc buck buco bucu budb budd budo budu bukk buko buku c-bo c-cd cbbc cbcc cbcu cbdb cbdc cbdo cbko ccbc cccb cccc cccu ccdc ccob ccoc ccod ccuc cddb ckbc ckck ckco ckdo ckdu ckob ckoc ckoo cobb cobo cobu cock coco cocu codd cok- coko coob cood cook coub coud couk cub- cubb cucc cuck cuk- d-bo dbcc dcbc dccb dccc dccu dcdb dddd ddoc ddub dkdc dobb dobu dock doco docu dod- dodd dodo doko doob dood dook doub douc doud douk dub- dubb dubc dubu duck duco dudd dudo dudu duku duo- kbbb kbbc kbbd kbbk kbbo kbbu kbcb kbck kbco kbcu kbdb kbdo kbkb kbkk kbko kbob kboc kbod kbok kboo kbub kbuc kbud kbuk kbuu kcbc kcbd kcbk kcbu kccb kccc kccd kcck kccu kcdc kcdd kcdu kckc kckk kcko kcob kcou kcub kcuk kdbb kdcc kdcd kdco kddb kddc kddd kddk kdkb kdkd kdkk kdko kdoc kdok kdub kduc kkbb kkbd kkbo kkcb kkcd kkck kkco kkdc kkdd kkdo kkkk kkob kkoo kkuu kobb kobc kobk kobo kobu kocb kocd kock kodk kodo kodu kokb kokc kokk koko koku koob kooc kook kooo koou koub kouu kubb kubc kubd kubo kubu kucb kucc kucd kuco kudd kudo kudu kukk kuku kuok kuoo kuub kuuk kuuu obbo obkb obok ocbc occc odbo oddd odoo odou okcu okko okok ooku oooo oucc oudc ouu- ubbo uboc ubod ubud ucbc ucdc ucdd udbc udoo uduk ukcc ukko ukok uocc uuoc uuuu